Fractional, Multiple, Or Full Wave Length Linear Type Patents (Class 343/825)
-
Patent number: 11145950Abstract: Provided is technology improving antenna sensitivity. An electronic timepiece has: an antenna having a planar first electrode, a planar second electrode disposed to a position superimposed with the first electrode in plan view when seen from a first direction perpendicular to the first electrode, and a shorting member that shorts the first electrode and second electrode; and a planar conductor disposed in plan view to a position superimposed with the first electrode. The second electrode is disposed between the first electrode and the conductor in a side view from a second direction perpendicular to the first direction, and a connector electrically connects the second electrode and conductor.Type: GrantFiled: August 12, 2019Date of Patent: October 12, 2021Inventor: Tadashi Aizawa
-
Patent number: 11095041Abstract: A collinear antenna assembly and a series-fed omnidirectional collinear antenna array are provided. The collinear antenna assembly includes a plurality of phase delayers connected in series, and an end portion of each phase delayer is connected to an antenna radiating unit; the phase delayer includes a circuit wire printed on a dielectric plate, two ends of the circuit wire are connected to the antenna radiating unit, a wire length, a wire width and a wire spacing of the circuit wire are set based on preset wiring rules, the wire lengths, the wire widths and the wire spacing of the circuit wires of the phase delayers set based on different preset wiring rules are different, so that a phase and an amplitude fed to each antenna radiating unit are accurately controlled.Type: GrantFiled: February 28, 2019Date of Patent: August 17, 2021Assignee: NORSAT INTERNATIONAL INC.Inventors: Yazi Cao, Steve Hunt, Tong Li
-
Patent number: 10965018Abstract: A first ground conductor is disposed in or on a main substrate. In or on an antenna module, a first antenna and a second ground conductor operating as a ground electrode of the first antenna are disposed. A coaxial cable including a core wire and an outer conductor feeds power to the first antenna. The outer conductor is electrically connected to the first ground conductor at a first position, and is connected to the second ground conductor at a second position. A second antenna including a feed element and a parasitic element operates at a lower frequency than the operating frequency of the first antenna. The second ground conductor and a part of the outer conductor from the first position to the second position also serve as the parasitic element of the second antenna.Type: GrantFiled: April 13, 2018Date of Patent: March 30, 2021Assignee: MURATA MANUFACTURING CO., LTD.Inventor: Masahiro Izawa
-
Patent number: 8947313Abstract: An omni-directional antenna operable absent ground radials and providing at least 3 dB gain at a chosen wavelength relative to a dipole includes first and second like-oriented J-pole antennas and, coupled intermediate said J-pole antennas, a quarter-wavelength non-radiating delay line. Each J-pole antenna includes a half-wave radiating element, and a quarter-wavelength non-radiating section. The quarter-wavelength non-radiating delay line together with the quarter-wavelength non-radiation section of the second J-pole provide a half-wave non-radiating delay line. The result is that RF energy radiated by the first and second half-wave radiating elements are in proper phase, whereby gain is achieved. RF energy is coupled to the first J-pole antenna a distance ? above the zero impedance end of that antenna.Type: GrantFiled: November 15, 2010Date of Patent: February 3, 2015Inventor: Edison Fong
-
Patent number: 8878744Abstract: An antenna assembly having a characteristic frequency band includes an antenna feed, operatively connected to one of a radio frequency (RF) transmitter, an RF receiver, and an RF transceiver system, and a ground component. A first set of conductive elements, including either or both of linear, bent linear, and curvilinear elements, is operatively connected to the antenna feed. A second set of conductive elements, including either or both of linear, bent linear, and curvilinear elements, is operatively connected to the ground component. Each of the first set of linear conductive elements and the second set of linear conductive elements are configured as to provide substantially equal sensitivity within the characteristic frequency band across all elevation and azimuth angles.Type: GrantFiled: September 19, 2011Date of Patent: November 4, 2014Assignee: MP Antenna, Ltd.Inventor: Jack Nilsson
-
Patent number: 8836581Abstract: The present technology provides an improved antenna having a conductive first plate, a conductive second plate and a conductive third plate. The conductive first plate and the conductive second plate are disposed and have an electrical connection to form an external antenna structure having a U-shaped cross section. The conductive third plate is disposed parallel to the conductive first plate between the conductive first plate and the conductive second plate and has a proximate edge proximate the electrical connection. The conductive third plate has an electrical length with respect to the proximate edge corresponding to an odd integer multiple of a quarter of a guide wavelength associated with a resonant frequency of the antenna. The conductive third plate forms part of an internal antenna structure.Type: GrantFiled: January 3, 2011Date of Patent: September 16, 2014Assignee: NETGEAR, Inc.Inventor: Paul A. Nysen
-
Publication number: 20140071012Abstract: Systems and methods are provided for operating an existing antenna at a second, higher frequency. To this end, an antenna system includes an antenna feed and a first antenna assembly electrically connected to the antenna feed at a first end. The first antenna assembly has a first electrical length for a first frequency band and includes a substantially linear segment. A second antenna element is connected to the first antenna assembly and extends away from the first end of the first antenna assembly in a direction substantially parallel to the substantially linear segment. The second antenna element has an electrical length of one-quarter of a wavelength associated with a second frequency.Type: ApplicationFiled: September 13, 2012Publication date: March 13, 2014Inventor: Geoffrey N. MENDENHALL
-
Patent number: 8284104Abstract: A Radio-Frequency IDentification (RFID) receiver is disclosed that comprises a plurality of resonant structures arranged to form an antenna. The resonant structures are interconnected in series and are arranged, relative to one another, so as to achieve a received electrical signal with an increased voltage, when the antenna is exposed to an incident electromagnetic signal. This occurs for a majority of all possible incident electromagnetic signals and, therefore, an RFID receiver based on such an antenna provides, in a majority of cases, an improved performance.Type: GrantFiled: August 5, 2009Date of Patent: October 9, 2012Inventor: William N. Carr
-
Publication number: 20120119968Abstract: An omni-directional antenna operable absent ground radials and providing at least 3 dB gain at a chosen wavelength relative to a dipole includes first and second like-oriented J-pole antennas and, coupled intermediate said J-pole antennas, a quarter-wavelength non-radiating delay line. Each J-pole antenna includes a half-wave radiating element, and a quarter-wavelength non-radiating section. The quarter-wavelength non-radiating delay line together with the quarter-wavelength non-radiation section of the second J-pole provide a half-wave non-radiating delay line. The result is that RF energy radiated by the first and second half-wave radiating elements are in proper phase, whereby gain is achieved. RF energy is coupled to the first J-pole antenna a distance ? above the zero impedance end of that antenna.Type: ApplicationFiled: November 15, 2010Publication date: May 17, 2012Inventor: Edison Fong
-
Patent number: 8144062Abstract: A multi-band antenna includes a grounding portion (300), a number of radiating members and a short-circuit portion (200). The short-circuit portion comprises a first short-circuit piece (210) connecting with the grounding portion and located in a first plane, a third short-circuit piece (230) located in a third plane and connecting with the radiating members, and a second short-circuit piece (220) connecting the first short-circuit piece with the third short-circuit piece and located in a second plane, with the first and third short-circuit pieces disposed on the same side of the second short-circuit piece. The radiating members comprises a first radiating member (110, 140) in the third plane and a second radiating member (120, 140) extending towards the first plane.Type: GrantFiled: November 26, 2008Date of Patent: March 27, 2012Assignee: Hon Hai Precision Ind. Co., Ltd.Inventors: Yun-Lung Ke, Chen-Ta Hung, Shu-Yean Wang, Chun-Ming Chiu
-
Patent number: 8102329Abstract: In one embodiment, an integrated circuit antenna array is provided that includes: a low-voltage substrate supporting an RF transmission network, and a high-voltage substrate bonded to the low-voltage substrate, the high-voltage substrate supporting a plurality of antennas coupled to the RF transmission network through switch-mode power amplifiers integrated into a surface of the high voltage substrate.Type: GrantFiled: December 21, 2010Date of Patent: January 24, 2012Inventor: Farrokh Mohamadi
-
Patent number: 8094086Abstract: An electronically steerable antenna includes at least one driven element, at least one controllable counterpoise element, and a support structure on which the driven element and the controllable counterpoise element are disposed. The controllable counterpoise element has at least one geometric characteristic which can be varied. A radiating angle of the driven element is selectively controlled, at least in part, by modifying the geometric characteristic of the at least one controllable counterpoise element. The counterpoise element may include multiple conductive segments, at least a subset of which may be adapted to be individually electrically connected together so as to modify the radiating angle of the driven, element.Type: GrantFiled: August 29, 2007Date of Patent: January 10, 2012Assignee: Agere Systems Inc.Inventors: Roger A. Fratti, Anthony J. Grewe
-
Patent number: 8059034Abstract: A patch antenna system and method comprising a base extending in a first plane; at least one patch mounted in a plane substantially parallel to the first plane; spaced from the base by at least one metallic post such that between the base and patch is substantially only gaseous fluid (which may be air). At least one power source may be operatively connected to the at least one patch for generation of electromagnetic waves at a center frequency of approximately 5.8 Gigahertz. The method of neutralizing unattended microwave devices comprises connecting a power source to a patch antenna and operating the patch antenna at a frequency in the range of approximately 3.89 to of 5.85 Gigahertz in the vicinity of a suspected unattended microwave device used to activate an explosive device to thereby jam any communication signal to the unattended microwave device and prevent the activation.Type: GrantFiled: March 3, 2009Date of Patent: November 15, 2011Assignee: The United States of America as resprented by the Secretary of the ArmyInventors: Canh Ly, Arthur C. Harrison
-
Patent number: 7920094Abstract: In an antenna structure having a plurality of serially fed patch elements, at least one of the patch elements has a slot coupling to the continuation of the feed line for influencing the radiation of this patch element.Type: GrantFiled: June 17, 2005Date of Patent: April 5, 2011Assignee: Robert Bosch GmbHInventor: Thomas Hansen
-
Patent number: 7821460Abstract: An improved tunable antenna of planar construction is distinguished by the following features: in plan view perpendicular to the effective surface (7), the electrically conductive structure (13, 113) completely or partially covers the effective surface (7), the electrically conductive structure (13, 113) is coupled and/or connected galvanically or capacitively or serially and/or with interposition with at least one electrical component (125) with the ground surface (3) and/or a chassis (B) located on a potential or ground.Type: GrantFiled: August 16, 2007Date of Patent: October 26, 2010Assignee: Kathrein-Werke KGInventors: Gerald Schillmeier, Frank Mierke
-
Patent number: 7804457Abstract: A multi-band antenna is adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band. In the multi-band antenna, an antenna element has an electrical length of ¾ wavelength of the first frequency band. The antenna element has a first end adapted to be electrically connected to a power feeding point, and a second end. An inductor is electrically connected between the second end of the antenna element and a ground in a serial manner. The inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the second frequency band.Type: GrantFiled: December 26, 2006Date of Patent: September 28, 2010Assignee: Yokowo Co., Ltd.Inventors: Tadashi Oshiyama, Hirotoshi Mizuno, Yusuke Suzuki
-
Patent number: 7671817Abstract: An antenna arrangement for a communication device is provided that may include a monopole antenna element having a bottom side joined to a first lateral side and joined to a second lateral side. The bottom side may be joined to each lateral side at an angle less than 90 degrees for forming an antenna element area defined at least by the bottom side and the first and second lateral sides. The antenna element area may include an central part arcuate around a longitudinal axis in a conical fashion, so that at least a part of the bottom side is provided half a turn around the longitudinal axis.Type: GrantFiled: February 27, 2007Date of Patent: March 2, 2010Assignee: Sony Ericsson Mobile Communications ABInventor: Michael Moser
-
Publication number: 20090284433Abstract: There is provided with an antenna device provided on a board, which includes: a first linear element 6; a feed element 4; a ground element 5; a second linear element 7 and a third linear element 8 arranged in parallel with each other; a fourth linear element 9; a fifth linear element 10; and a sixth linear element 11. A first radiating element is formed of the first linear element 6 and the feed element 4, and the second radiating element is formed of a portion of the feed element 4, a portion of the ground element 5, and the second, third, fourth, fifth, and sixth linear elements 7-11.Type: ApplicationFiled: May 13, 2009Publication date: November 19, 2009Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yukako Tsutsumi, Masaki Nishio
-
Publication number: 20090256770Abstract: A monopole antenna includes a base board with a first side and a second side, a radiating element, a grounding element and a feeding line. The radiating element and the grounding element are located on the first side of the base board. The grounding element is two times longer than the radiating element. The feeding line includes an inner conductor connected to the radiating element and an outer conductor connected to the grounding element.Type: ApplicationFiled: April 14, 2009Publication date: October 15, 2009Applicant: HON HAI PRECISION INDUSTRY CO., LTD.Inventors: LUNG-SHENG TAI, CHUN-MING CHIU
-
Publication number: 20090102736Abstract: The invention relates to a monopole antenna with a radiating element mounted onto a base by means of a mast, of which the radiating element is formed from two conductive strands, in U, the length L of each strand being chosen such that ¼ ?g?L?½ ?g, ?g being the wavelength in a strand at a central radiation frequency F0.Type: ApplicationFiled: May 24, 2006Publication date: April 23, 2009Inventors: Philippe Minard, Ali Louzir, Jean-Francois Pintos, Jean-Luc Robert
-
Publication number: 20090102737Abstract: A J-Pole antenna disclosed including: shunt segment extending out of the plane of the J-Pole antenna. A shunt segment extending out of the plane of the J-pole antenna aids in attaching the antenna to a connector and allowing for a reduction in the size of the antenna and connector. The shunt segment also makes the antenna shorter while preserving the same gain and impedance performance as a conventional J-Pole antenna. A connector plate and connector may be used with the antenna having the shunt segment extending out of the plane of the J-Pole antenna. A protective enclosure may be used with the J-Pole antenna and allowing a radiating antenna segment of the J-Pole antenna to extend from the protective enclosure.Type: ApplicationFiled: March 30, 2007Publication date: April 23, 2009Inventors: Thomas Birnbaum, Brad Gilbert, Thomas Mabry
-
Patent number: 7522119Abstract: A multiband antenna with removed coupling includes a radiator formed as a meander line bent zigzag several times and having a gap filling part in at least one area between neighboring meander lines. The gap filling part interconnects the neighboring meander lines. The multiband antenna further includes a ground connected with the radiator and at least one switch element mounted in an area along the longitudinal direction of the radiator and configured to alternately short or open an area of the radiator. Accordingly, two different resonance frequencies can be tuned using the single antenna, and the antenna efficiency can be enhanced by removing the coupling between the resonant frequencies that are tuned through the gap filling.Type: GrantFiled: December 1, 2006Date of Patent: April 21, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-won Jung, Young-eil Kim, Se-hyun Park
-
Patent number: 7456631Abstract: An NMR (nuclear magnetic resonance) probe is offered which produces a magnetic field strength adapted for producing an NMR signal within a sample coil. The probe has a resonant circuit including a sample coil, a first transmission line, and a second transmission line. The resonant circuit is designed taking account of the transmission line length Ls of the coil, the transmission line length La of the first line, and the transmission line length Lb of the second line. The coil is placed in a position where the magnetic field strength is maximized. Where the electrical characteristics of the resonant circuit are varied by connection of the coil and transmission lines, the transmission line lengths are corrected according to the variations.Type: GrantFiled: August 20, 2007Date of Patent: November 25, 2008Assignee: Jeol Ltd.Inventor: Hideo Shino
-
Patent number: 7420521Abstract: A wideband antenna comprised of two or more conductive segments that are parasitically coupled.Type: GrantFiled: January 8, 2007Date of Patent: September 2, 2008Assignee: Applied Radar Inc.Inventor: Bryan L. Hauck
-
Patent number: 7298346Abstract: A wideband monopole antenna including an emitter which is embodied in the form of a disc and vertically arranged at a predetermined spacing above an electrically conductive base plane. The disc-shaped emitter includes a modified section initially having a circular or elliptical disc form, with the modified section being limited by a border outline deviating from the circular or elliptical form.Type: GrantFiled: August 9, 2005Date of Patent: November 20, 2007Assignee: Huber + Suhner AGInventors: Wolfgang Heyde, Carsten Dieckmann, Cenk Koparan, Eugen Spirig
-
Patent number: 6970136Abstract: An antenna apparatus coupled to a feeding point arranged on a cavity is disclosed. The apparatus includes a linear element extending from the feeding point and having a physical length that is shorter than a one-quarter wavelength. A half-wave antenna element is connected to an end of the linear element. The apparatus also includes a metal conductor piece including a connecting point between the linear element and the half-wave antenna element and located close to one surface of the cavity. The linear element includes a first portion extending in a first direction opposite to that of the half-wave element from the feeding point and in parallel with one surface of the cavity and a second portion extending in a second direction, which is equal to a direction in which the half-wave antenna element extends, and in parallel with one surface of the cavity.Type: GrantFiled: September 15, 2003Date of Patent: November 29, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Shuichi Sekine, Hiroshi Watanabe, Motoji Noda, Noriaki Odachi
-
Publication number: 20040246192Abstract: A variable-directivity antenna comprises an omnidirectional antenna element, a transmission line connected to the antenna element, and an electric field adjusting structure provided in a boundary region between the antenna element and the transmission line. The electric field adjusting structure is configured to change electric field distribution of the transmission line to a desired direction.Type: ApplicationFiled: March 17, 2004Publication date: December 9, 2004Inventor: Satoru Sugawara
-
Patent number: 6677905Abstract: An antenna device includes: a radiator having a meander portion; and a conductor shorter than the radiator which is disposed opposite to the radiator. A coaxial cable is connected to the radiator and conductor. Respective line lengths of the radiator and conductor satisfy a predetermined relation with respect to a wavelength of a signal to be transmitted and received. The antenna device achieves at least one of improved antenna characteristics, downsizing, and improved mechanical strength.Type: GrantFiled: February 13, 2002Date of Patent: January 13, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Futoshi Deguchi, Toshinori Komesu, Akihiko Hirata, Sumio Tate
-
Patent number: 6661382Abstract: An antenna apparatus coupled to a feeding point arranged on a cavity is disclosed. The apparatus includes a linear element extending from the feeding point and having a physical length that is shorter than a one-quarter wavelength. A half-wave antenna element is connected to an end of the linear element. The apparatus also includes a metal conductor piece including a connecting point between the linear element and the half-wave antenna element and located close to one surface of the cavity. The linear element includes a first portion extending in a first direction opposite to that of the half-wave element from the feeding point and in parallel with one surface of the cavity and a second portion extending in a second direction, which is equal to a direction in which the half-wave antenna element extends, and in parallel with one surface of the cavity.Type: GrantFiled: September 25, 2001Date of Patent: December 9, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Shuichi Sekine, Hiroshi Watanabe, Motoji Noda, Noriaki Odachi
-
Patent number: 6441791Abstract: The present invention provides a glass antenna device for mobile communication with suitable impedance matching for two different frequency bands. In this antenna device, the ends of a substantially straight first radiation antenna pattern and a second radiation antenna pattern are coupled by a coupling pattern that is substantially perpendicular to the first and second radiation antenna patterns. The longitudinal direction of the coupling pattern is arranged substantially in parallel to the ground. The length of the first radiation antenna pattern is different from the length of the second radiation antenna pattern. A rectangular grounding pattern is arranged below this U-shaped antenna pattern. A core conductor of a coaxial cable is connected to the U-shaped antenna pattern, and a braided conductor of the coaxial cable is connected to the grounding pattern. An impedance-adjusting pattern is provided on a lateral portion of the grounding pattern.Type: GrantFiled: September 19, 2000Date of Patent: August 27, 2002Assignee: Nippon Sheet Glass Co., Ltd.Inventor: Hidetoshi Oka
-
Patent number: 6218992Abstract: Inverted-F antennas having elongated, conductive elements for use within communications devices, such as radiotelephones, are provided. An elongated, meandering conductive element having a plurality of spaced-apart U-shaped undulations is maintained in adjacent, spaced-apart relationship with a first ground plane. One or more of the U-shaped undulations capacitively couple to the ground plane and allow the antenna to resonate at lower frequencies and with a greater bandwidth. A second ground plane may be oriented in a direction transverse to the first ground plane so as to be positioned in adjacent, spaced-apart relationship with one or more of the U-shaped undulations. One or more of the U-shaped undulations can capacitively couple to the second ground plane, as well as to the first ground plane. In addition, one or more inductive elements may be electrically connected to an elongated conductive element.Type: GrantFiled: February 24, 2000Date of Patent: April 17, 2001Assignee: Ericsson Inc.Inventors: Robert A. Sadler, Gerard James Hayes, Mohammod Ali
-
Patent number: 5917457Abstract: U-dipole radiating elements (10) and associated feed conductors (20, 22) are cut or stamped from brass sheet stock. Each U-dipole (10) is then bent up at 90 degrees to the signal distribution conductor (22) which is supported in front of a reflector (12). The U-dipole element (10) includes a first dipole-type conductor segment (14) connected near one end to a feed segment (20) which is the sole signal feed path to the U-dipole element. A second dipole-type conductor segment (16), which is spaced from and parallel to and coextensive with first segment (14), is connected to the other end of the first segment (14). An antenna may include one or more individual U-dipole elements cut from sheet stock and connected to feed points. In a linear array antenna configuration, a group of U-dipole elements (10a-10b) and associated signal feed network components may be cut in a unitary form from a sheet of conductive material and supported in front of a reflector surface.Type: GrantFiled: February 21, 1997Date of Patent: June 29, 1999Assignee: Marconi Aerospace Systems Inc. Advanced Systems DivisionInventor: Alfred R. Lopez
-
Patent number: 5640169Abstract: A protected antenna apparatus including an elongated tube; a cable having an upper end with a pair of separate bare leads extending therefrom, a lower end with a connector secured thereto, and an intermediate portion extended between the ends; a twin-lead transmission line having a central axis, a free upper end, a lower end with the bare leads extending therefrom and interconnected together, an intermediate location therebetween wherein each lead is connected with one of the bare leads of the cable, and a notch formed on an upper extent of the line at a location between the intermediate location and the upper end to thereby divide one of the leads into two different pieces and thus create a J-pole antenna having a short leg, a long leg, and an impedance matching stub portion therebetween, and wherein the antenna transmits radio signals of a characteristic frequency as a function of the lengths of the legs and the stub portion; and a coupling mechanism for securing the antenna within the tube and along a longType: GrantFiled: October 23, 1995Date of Patent: June 17, 1997Inventor: James C. Weaver
-
Patent number: 5600339Abstract: An antenna comprising a first conductive element having a first end and a second end. The antenna is also comprised of a second conductive element having a first end and a second end. The second conductive element is adjacent and essentially in parallel to the first conductive element. The antenna is also comprised of a third conductive element connected to the first conductive element and second conductive element at their first ends therewith so signals in the third conductive element can pass to the first conductive element and second conductive element.Type: GrantFiled: December 6, 1994Date of Patent: February 4, 1997Inventor: Edward A. Oros
-
Patent number: 5451971Abstract: An antenna is provided comprising first (11), second (12) and third (13) line elements dispersed on first, second and third consecutive sides of a rectangle (10). The third line element is longer than the first line element by a length approximately equal to the length of the second line element, thereby providing a radiating portion of the third line element. A feed connector (14) is coupled to the first and third line elements, for applying a radio frequency signal to the antenna for radiating from the second line element and from the radiating portion of the third line element.Type: GrantFiled: July 13, 1993Date of Patent: September 19, 1995Assignee: Motorola, Inc.Inventors: Ovadia Grossman, Avi Tooba
-
Patent number: 5406295Abstract: A window antenna for a motor vehicle body opening in which the antenna is used for mobile radio in a double-band operation with bands have a long wavelength L and a short wavelength K. Two monopoles L/4 and K/4 are electrically connected by a foot portion to which the core of the coaxial feeder cable is adjoined. Two radials corresponding in dimensions to the monopoles can extend along at least one edge of the pane and parallel to the frame member. The radials are connected to the shielding. The spacing of the radials from the frame, the width of the radials and their lengths are selected so that the radiation characteristics are optimized and standing surface waves on the shielding of the cable is avoided.Type: GrantFiled: February 24, 1993Date of Patent: April 11, 1995Assignee: Flachglas AktiengesellschaftInventors: Detlef Baranski, Peter Reichmann, Peter Paulus
-
Patent number: 5392055Abstract: A radio antenna which takes the form of a flexible elongated transmission cable. This cable encloses a pair of conductors which are insulated from each other. The cable is encased in an electrically conductive sheath. The received signal is picked up by the sheath and transmitted through an impedance matching network and into the pair of conductors. The length of the sheath is correlated to a preselected fractional value of the wavelength of the received signal.Type: GrantFiled: January 4, 1993Date of Patent: February 21, 1995Assignee: Recoton Inc.Inventors: Peter A. Madnick, Richard J. Kaufman
-
Patent number: 5065164Abstract: A monopole antenna adapted for efficiently radiating energy over an enhanced range of frequencies. The antenna includes a vertically inclined wire approaching one-quarter wavelength of said range of frequencies and a number of small-sized inductors installed along the length of said wire. The inductors are spaced apart so as to have negligible mutual coupling and are sized sufficiently small so that they do not have individual resonances over the range of frequencies for which the antenna is operational. The inductors provide a distributed reactance which allows the antenna to operate with greater efficiency over a broader range of frequencies.Type: GrantFiled: August 8, 1989Date of Patent: November 12, 1991Assignee: Rockwell International CorporationInventor: Richard E. Deasy
-
Patent number: 4757322Abstract: A mobile antenna unit for use in the FM broadcast band which is adapted to be mounted on the windshield of the vehicle and which provides a gain and directivity pattern similar to those of an external whip antenna. The antenna element takes the form of a conductor mounted near one of the pillars supporting the windshield. The pillar appears electrically as an inductor and the conductor as a capacitor. By properly dimensioning and spacing the conductor with respect to the pillar, resonance is achieved in the FM broadcast band.Type: GrantFiled: September 25, 1985Date of Patent: July 12, 1988Assignee: Pioneer Electronic CorporationInventors: Tomohisa Yokogawa, Shintaro Gomi
-
Patent number: 4739336Abstract: A plurality of dual feed half square wave antenna element (each of U-shaped onfiguration) are arranged in a log-periodic structure. The antenna elements are feed at the current loops; i.e., at the corners of the U-shaped antenna elements. A dual inphase feed produces vertical polarization signals of low angle radiation, and a dual antiphase feed produces horizontal polarization signals of high angle radiation.Type: GrantFiled: August 28, 1986Date of Patent: April 19, 1988Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Donn V. Campbell, Palemon W. Dubowicz, Bernard Feigenbaum, Kenneth Loffer
-
Patent number: 4673949Abstract: A radio antenna which operates over a broad frequency band, comprising a half-wave antenna tuned to a frequency beyond one cut-off frequency of the desired frequency band and a quarter-wave transformer tuned to a frequency beyond the other cut-off frequency at the other end of said band. The quarter-wave transformer acts as an impedance compensation device by canceling the reactive components of the half-wave antenna such novel reactive cancellation technique provides broadband performance while maintaining the antenna's gain and impedance characteristics.Type: GrantFiled: September 24, 1984Date of Patent: June 16, 1987Assignee: Modublox & Co., Inc.Inventor: Jack W. Sheriff
-
Patent number: 4644364Abstract: Impedance matching between two conductor transmission lines and conventional antenna designs including a straight antenna element having an effective length of at least one-quarter wavelength in the operating frequency range and a zero impedance at one end is disclosed in which a straight coupling conductor having a length of about one-quarter wavelength in the operating frequency range is mounted in close spaced co-planar relation to such antenna element with one end electrically connected to the zero impedance end of the antenna element. The two conductors of the transmission line are coupled to the antenna element and coupling conductor, respectively, at the interconnected ends thereof and the spacing between the antenna element and the coupling conductor is adjusted along their coextensive lengths to achieve an impedance match at each frequency in the operating frequency range.Type: GrantFiled: December 7, 1984Date of Patent: February 17, 1987Inventor: Malcolm G. Parks
-
Patent number: 4259673Abstract: An antenna having a unique method of feed is comprised of a vertical radiator and a driven element. The driven element is defined by an integral, substantially straight part. RF energy is fed into or extracted from the antenna by a coil perimetrically wound around the straight part of the driven element. Preferably, this coil is comprised of the exposed, insulated inner conductor of a coaxial cable. The coil covers a relatively large segment along the periphery of the driven element giving rise to unique electrical properties. With this method of feed, the antenna exhibits good bandwidth and requires no metal-to-metal contact between feedline and antenna.Type: GrantFiled: June 5, 1979Date of Patent: March 31, 1981Inventor: Harold Guretzky
-
Patent number: 4138681Abstract: An antenna for a hand-held radio transceiver includes first and second elements extending from the radio's case. The first element is comprised of a pair of series coupled members having electrical lengths of one-half and one-quarter wavelength, respectively, with the free end of the second member being coupled to the transmitter output. The second element couples to the radio's electrical ground and is configured to form a transmission line with the second member. The effective electrical length of the second element, including the influence of the elements parasitic coupling to the radio, is adjusted to be one-quarter wavelength.The resulting antenna structure minimizes surface currents across the radio's body, thereby substantially eliminating power loss caused by absorption in the user's body.Type: GrantFiled: August 29, 1977Date of Patent: February 6, 1979Assignee: Motorola, Inc.Inventors: Allen L. Davidson, James M. Durante